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Our Authoritative DNS (AuthDNS) cluster announces and 2001:67c:e0::/48 from AS 197000. The service hosts reverse DNS zones,, and provides secondary service for various ccTLDs.

The cluster is composed of three core instances located in Amsterdam, London and Stockholm. At each of these sites, a router spreads the DNS queries across three servers, running a mix of BIND, Knot DNS and NSD. The routers are connected to Internet exchanges at 1 Gbit/s.

To increase the capacity of the service, we are also working with other organisations willing to host AuthDNS instances on their own servers. At present, Anexia IT hosts an instance in Vienna and NaMeX hosts an instance in Rome. 

The RIPE NCC offers a best-effort secondary name service to the other Regional Internet Registries (RIRs) and some country code top-level domain (ccTLD) operators who are in the start-up phase of their operations.

Reverse DNS delegations allow applications to map to a domain name from an IP address.